Picture frame



FIG. 1 is a perspective view of a picture frame showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof, the opposite side being a mirror image; and,

FIG. 5 is a bottom plan view thereof.

The rear of the article is flat and unornamented. 

The ornamental design for a picture frame, as shown and described. 